copperwall/custom_validity.js

## custom_validity.js
Form.customValidityFactory = (constraint, validationMessage = 'Invalid') => (...args) => (
   constraint(...args) ?  '' : validationMessage
);
	Form.customValidityFactory = (constraint, validationMessage = 'Invalid') => (...args) => (
	constraint(...args) ? '' : validationMessage
	);